A method for reducing co-frequency interferences

Abstract

The application discloses a method for reducing co-frequency interferences. The method comprises the following steps: frequency resources of broadcast / synchronization channels are allocated to regions according to a principle that the frequency resources of the broadcast / synchronization channels of adjacent regions are mutually orthogonal to each other; for each region, according to a principle that access frequency bands of adjacent regions are mutually orthogonal, some of the frequency resources are selected from the service channel frequency resources as the access frequency band of the corresponding region; the access frequency band of each district is a subset of edge frequency band resources of the corresponding district in interference coordination; a network side uses the resources of the frequency broadcast / synchronization channel of each region to broadcast related information used for user access; and when a UE monitors the broadcast information and initiates a random access and an attached procedure to a base station, the base station employs a preset downlink channel send power to control the UE to complete corresponding access and attachment in the access frequency band of the region where the UE belongs. According to the invention, the co-frequency interferences in a period from the user access to the completing of attachment in co-frequency networking can be effectively reduced.

Description

technical field [0001] The invention relates to resource configuration technology of a mobile communication system, in particular to a method for reducing co-channel interference. Background technique [0002] In a cellular wireless communication system based on OFDM technology, users in a cell realize mutual orthogonality between signals through frequency division multiplexing, so as to solve the problem of interference in the cell. But as a price, the same-frequency networking will bring strong inter-cell interference. At the same time, users at the edge of the cell and users in the "blind spot" of the base station's coverage area often have poor signals. Once they are interfered by the same frequency, there will be problems in the entire channel transmission process. Among them, the user's random access process is particularly important; at the same time, the user attachment process has a control plane delay requirement. For users, during the process from random access ...

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Problems solved by technology

[0005] However, when the inter-cell co-channel interference is large, the channel of the user during random access is poor, and messages 2, 3, and 4 may always be transmitted incorrectly, so that the UE cannot successfully complete the random access process

In addition, after the random access is completed, the co-frequency interference between cells is relatively large, and HARQ / ARQ retransmissions are frequent during the attach process, and it is difficult to meet the user's control plane delay requirements, causing the user to fail to attach.

[0006] At present, no method has been proposed that can effectively solve the problem of co-channel interference during the period from user access to completion of attachment in co-frequency networking

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